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I had several Nr overlimit detected few weeks ago(Nr indication ont the gauge was correct). There is no issued flight time for this overlimit, but the pilot had several ''gong song''. The troubleshooting revealed a defective Nr sensor and it's a known issue by ECL and they published a service letter for that.
The problem is that the magnetic core of the sensor is coming out of their casing and pulling on the wire, causing false indication/Nr overlimit. It also can cause rubbing on phonic wheel. There's is an SB on the AMM about Nr sensor replacement by a superseded one, but you have to do some modification of the wiring, to put a new canon plug.
But in you're case, you say that you have also Ng overlimit, so I'm not sure that this is the same problem, it's not suppose to cause Ng false indication...
I know that you had this snag few weeks ago, I hope that you had already solve it.
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